"Denatures" is the word you are looking for!
Answer:
Biotic factors are just everything living (bio-) in an ecosystem. So they're bound to vary in every ecosystem, based on the biome, climate, other food sources available, et cetera.
Do you see flamingoes in the forest? No, you say? Well, they're living; they're biotic factors. They aren't in a forest or a jungle ecosystem because that's not their habitat and they don't thrive there.
Answer:
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One of the amazing things about alternative energy resources is that they are renewable, unlike fossil fuels. The use of fossil fuels, such as coal and natural gasses, can contribute a lot to pollution since fossil fuels are usually processed through factories and plants. With water, wind, and solar energy, it is much easier to gain electricity with those methods rather than others, and much cheaper.
